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omTED STATES PATENT oFF-ica.A g

WILLIAM SMITH, OF BANGOR,r MAINE.

MACHINERY 'FOR SAWINGr SHINGLES.

Specification of Letters Patent No. 5,768, dated September 12, 184B.

To all whom t may concern.'

Be it known 'that I, WILLIAM SMITH, of Bangor, in the county ofPenobscot and State of Maine, have inventecl'sundry new and usefulImprovements in Traversing the Carriage of Self-Acting Shingle-Machines,and that the following is a full, clear, and exact description of theprinciple which distinguishes it from all other things before known andof the manner of arranging, constructing, and using the same, referencebeing had to the accompanying drawings, making part of thisspecification, in which- Figure 1 is a plan of the machine. Fig. 2 is alongitudinal vertical section through the line x, w, of Fig. 1. The sameletters refer to like parts in all the figures. The improved parts areshown colored.

It is obvious, if a shingle bolt is moved past a circular saw above itsaxis, that the thicker the bolt is, the farther it must move forward tobe cut entirely through, owing to the curve o-f the saw; and if itrequires as much time to run through a narrow bolt, as is occupied by athick one, great loss of time would ensue; therefore my invention ismade to obviate this difliculty, and consists in connecting anvapparatus to the carriage comprising a shaft which is aflixed to therear end of the carriage on which there is a lever that rests on thebolt to be sawed, so as to gage a hand or pawl, placed on the sameshaft, and make it. strike a sliding inclined rack, that throws the feedpinion out of gear sooner or later, according to the thickness of r thebolt to be sawed, by which a saving of time in the running of thecarriage is effected, in a simple, cheap and efficient manner; and by anapparatus that is not liable to get out of order, or become clogged bythe saw dust, or other causes, a difficulty which always exists in thecomplicated machinery now in use, in self acting shingle machines.

The carriage, ways, and frame of my machine, together with the saw, arelike those now inrcommon use. Under the rear end of the carriage ashafta is placed the journals thereof being fitted to boxes attached to .the

'frame of the carriage; on the end of the shaft a outside of thecarriage frame a lever o is affixed, that extends up in an inclinedposition, and rests on the shingle bolt o which is being sawed; near theother end of the shaft a there is a pawl or hand d, that turns with theshaft and lever above namedby which it is obvious. the pmi will braised, in proportion tothe thickness ofthe bolt on which the leverrests. An inclined rrack e is attached to the stationary frame,

near .the sawshaft, and in the same vertical plane as the pawl d, sothat when the carriage is fed forward by the feed pinion f, in thedirection of the arrow Fig. 2, the pawl cl will sooner or later strikethe rack, according to the height to which it is raised `by the bolt, asabove described. When the rack is struck by the `pawl it slides endwise,far enough to throw the feed pinion out of gear, and allow the carriageto run back, in a manner about to be described. A long horizontal leverg is attached by its fulcrum pin h to the side of the stationary frame.The feed pinion f is hung in this lever g so that it is moved up anddown by it, and is thus thrown into or out of gear. To each end of thelever g a hook is attached, one of these, next the pinion, when that endof the lever is raised, catches on the pin z' that holds it in itsposition. vThis hook i which is shown in this position in Fig. 2,keepsthe pinion f in gear with the rack on the bottom ofthecarriagewhich is thereby fed forward, till the pawl above named'strikes,and moves the rack e, a projection lo on which, strikes the top of thehook z" and detachee it from the pin it is drawn down by a weight Zsuspended to it, and thus throws the feed pinion out of gear. Thispermits the carriage to run back to the starting point, to which it isdrawn by ,a weight m that isattached to it by a cord a. This cord passesover a pulley 0 on the upper end of a crank lever 0, to the other, orhorizontal arm of which a weight p is suspended; so` that when thc cordn is drawn tight, it holds up the weight p, but when the carriage runsclear back, the pulley 0 islfreed from the cord n and the weight p fallsso as to bear on the end' of the lever g, which is held up `by the hoo'kg on the end thereof, till the carriagefrecedes far enough to unfastenit from the pin r; when they are carried down by the combined weights pand s (tll'elatterbeing affixed*k to the hook g) which overbalances theweight at the opposite end ofthe lever -g before named, till the pinionf is again brought into gear with the rack on the carriage, and the hookz" is caught on the pin c' as at first described. The carriage is thendrawnfor- YWard again, carrying the pulley 0 forward also, to theposition shown in Fig. 2, andreilo lievingthat end of the lever from theweight p, so that the opposite end ofthe lever will preponderate whenthe hook z" is relieved in the manner before described.

By the above arrangement itis obvious that the carriage will continue toreciprocate between the two points that are just suflicient to saw theshingle bolt, whatever may be its thickness.

Having thus fully described my improvements what I claim therein as newand for which I desire to secure Letters Patent is- 1. Connecting thelever, 'which rests on the shingle bolt that is to be sawed, with thecarriage in combination with the 'pawl and 15 sliding rack, for throwingthe feed pinion out of gearg substantially as above set forth.

`2. I also claim the weights Z, p, and s, arranged and combined with thelevers as herein made known, for causing the ends of 20 WM. SMITH.

In presence of MOSES L. APPLETON, HENRY GILMAN.

